Broken link and curl cmd in Kubernetes deployment prerequisites

[Rafael Vasquez]

Under prerequisites, the link to OpenShift cluster documentation is broken while the curl command returns Not Found%.

[Christian Kadner]

Thanks Rafael, for identifying the dead link.

@Tomcli @yhwang -- I assume this should be the updated link to create OpenShift clusters on the IBM Cloud: https://cloud.ibm.com/docs/openshift?topic=openshift-openshift_tutorial

[Yihong Wang]

@ckadner your link is correct.